The attachment bonus if its an equipment is nice, especially if you manage to steal something like Colossus Hammer, but its mostly just the sprinkles and icing on top
5 Rings of Brighthearth, and Basalt Monolith Though colourless mana isn't quite as useful as coloured, a two-card infinite combo that can slot into any deck is well worth it
While their methods differ, there's ample opportunity for deals from both vendors
Display of Power, See Double, and Choreographed Sparks
If the target of Dross Skullbomb's last ability isn't a legal target as the ability tries to resolve (probably because it has left the graveyard), you won't draw a card
Click on any of the sets from there and you'll get all kinds of detailed information about that specific set